Expansion valve



FIG. 1 is a front view of an expansion valve, showing my new design;

FIG. 2 is a rear view of the expansion valve.

FIG. 3 is a left side view of the expansion valve, the right side view being symmetrical with the left side view of the expansion valve;

FIG. 4 is a plan view of the expansion valve; and,

FIG. 5 is a bottom plan view of the expansion valve. 

The ornamental design for an expansion valve, as shown and described. 